diff --git a/app/javascript/application.js b/app/javascript/application.js
index b72a57bf8..e917b49c5 100644
--- a/app/javascript/application.js
+++ b/app/javascript/application.js
@@ -1,5 +1,4 @@
 // Configure your import map in config/importmap.rb. Read more: https://github.com/rails/importmap-rails
 import "@hotwired/turbo-rails"
-import "extensions"
 import "initializers"
 import "controllers"
diff --git a/app/javascript/extensions/array_extensions.js b/app/javascript/extensions/array_extensions.js
deleted file mode 100644
index 9e8b8822a..000000000
--- a/app/javascript/extensions/array_extensions.js
+++ /dev/null
@@ -1,17 +0,0 @@
-Array.prototype.toSentence = function() {
-  const length = this.length
-
-  switch (length) {
-    case 0:
-      return ""
-    case 1:
-      return `${this[0]}.`
-    case 2:
-      return `${this[0]} and ${this[1]}.`
-    default:
-      return this.map((item, index) => {
-        const isLast = index === length - 1
-        return isLast ? `and ${item}.` : item
-      }).join(", ")
-  }
-}
diff --git a/app/javascript/extensions/index.js b/app/javascript/extensions/index.js
deleted file mode 100644
index 5424290ea..000000000
--- a/app/javascript/extensions/index.js
+++ /dev/null
@@ -1 +0,0 @@
-import "extensions/array_extensions"
diff --git a/config/importmap.rb b/config/importmap.rb
index 4ea592f21..3398c83de 100644
--- a/config/importmap.rb
+++ b/config/importmap.rb
@@ -7,5 +7,4 @@ pin "@hotwired/stimulus-loading", to: "stimulus-loading.js"
 
 pin_all_from "app/javascript/controllers", under: "controllers"
 pin_all_from "app/javascript/helpers", under: "helpers"
-pin_all_from "app/javascript/extensions", under: "extensions"
 pin_all_from "app/javascript/initializers", under: "initializers"